Update the home record

What goes in the file

A complete addition home record contains:

• Issued building permit (final, with closure date).
• All issued sub-permits (electrical, mechanical, plumbing) with closure documentation.
• Final inspection report and Certificate of Occupancy.
• As-built drawings — the permit set marked up to reflect what was actually built (the GC should provide these).
• Stamped structural drawings + calculations.
• Lead and asbestos report from step 0.4 + clearance letters from step 5.1.
• All lien waivers — conditional progress + unconditional final, from GC and every sub/supplier.
• GC contract + signed change orders.
• Builder's Risk policy + homeowner policy update reflecting the addition.
• Equipment manuals and warranties for new HVAC, water heater, appliances.
• Energy code compliance documentation + blower-door / duct-leakage test results.

Why it matters

When you eventually sell (or refinance, or insure a claim), the title company and insurance carrier ask for the addition file. A complete, organized file makes this a 10-minute conversation. A scattered file makes it a 3-week dig through old emails.

King County Assessor

The Assessor will reassess the property based on the addition. Expect a revised assessed value letter within 6–12 months of CofO; property tax adjustments follow. This is automatic — no action required from you, but expect the bill to go up.

You're done

The 14-to-24-month project is over. The house has its second story. The family is back in. The home record is up to date.

For most homeowners this is the largest single project they'll ever do on their home. The next time you open the home record file will probably be at sale.